Well that depends a lot on the offset and width of the 19" wheels as well as the width of the tires. If you do, say, 19x8, +45 offset with 225/35ZR19 (is that an available size?) tires and the spokes clear the brakes, you should be okay without rubbing, especially at stock ride height. If you lower the car, it will be very close, probably occasional rubbing. I don't know if they make 19x7.5, but if they do, with a +45mm offset and 215/35ZR19 tires (do they make such a size?), you won't rub. Either way, the ride will be affected in a bad way by the low profile tires and you're risking a bent rim on your wheels, but that's your call. 19s also tend ot be heavy, and the 18x8.5s I had on my car a small while ruined the way the car drove (not even counting the rubbing problems).
-Ed
EDIT PS those 18x8.5s were +40 offset, which did not help matters, but they had a hude like 12mm gap between the spokes and the calipers, so it was definitely overkill. This is most likely a combination of the +5mm lower offset as well as the huge 8.5" width.